How to properly write a man page

The always brilliant Bjarni Ingi Gislason has a number of well written ideas and suggestions and a patch for the `beep.1` man page at [Debian Bug 1071391](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1071391).

For details, refer to the Debian bug. This issue is just to keep all issues in one place and give an easy to find and click place to find the details.